Boring-tool.



T. J. HINBS.

' BORING TOOL.

APPLIOATION FILED 1m: 10, 1909.

963,559. Patented Ju1y 5,1910.-

Ammm I which hold the tool securely THOMAS J'. I-IINES, OF DETROIT,MICHIGAN.

BORING-TOOL.

Specification of Letters Patent.

Application filed May 10, 1909.

Patented July 5, 1910. Serial No. 495,160.

To all whom it may concern:

Be it known that I, THOMAS J. HINES, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in Boring-Tools, and declare thefollowing to be a full, clear, and exact description of the same, suchas will enable others skilled in the art to which it pertains to makeand use the same, reference being had to the accompanying drawings,which form a part of this specification.

This invention relates to boring tools, and has for its object animproved head adapted to be used with a lathe and employed to bore holesof various diameters within the limit of its capacity.

In the drawing :Figure 1, is a side elevation of the tool. Fig. 2, across-section at the line aa of Fig. 1. Fig. 3 an elevation showing theVernier graduations. Fig. 4:, a longitudinal section of the secondaryholder of the tool.

The head of the tool 1 is provided with means by which it may be held inthe lathe in a suitable manner, as for example, with a tang 2 adapted tobe held centrally by a chuck carried by a lathe head. The head 1 isprovided with a longitudinal cylindrical bore, or socket 21, whose axisis parallel to the axis of the tool head 1, and whose center 1 iseccentric to the center 5 of the tool head 1. It is also provided with across-bore 21 parallel to a diameter. A subordinate or secondary toolholder 6 engages in this bore or socket and is capable of rotation onits own axis therein. The subordinate holder 6 is provided with a bore 7adapted to receive the tang of the tool 8. The bore 7 is eccentric tothe center 4: of the subordinate tool holder, and the rotation of thesubordinate tool holder on its own axis rotates the tool, carrying itaround the curved path indicated by the dotted line 9 in Fig. 2.

The tool proper is held in the subordinate holder 6 by means of setscrews 10 and 11 with respect to the subordinate holder. The subordinateholder is held in the head 1 by means of a clampconsisting of two jawmembers 12 and 13 held together by means of a prismatic headed screw 14.The screw engages through one of the jaw members 12 and into the otherjaw member 13 and the jaw members are drawn together by means of thescrew or are loosened by turning the screw to free them. The clampengages in the cross-bore 21, which crosses the head 1 parallel with thediameter thereof, and with the bore of the hole cutting into the bore ofthe socket in which the subordinate tool holder engages. The meetingends of the two jaw members 12 and 13 are trimmed to present curvedfaces of the trimmed part just within the socket so that if the two jawmembers be spread somewhat the subordinate holder will easily engage inthe socket, and then if the screw 14: be turned to bring the jaw memberstogether, the jaw members will bear with force against the subordinatetool holder clamping it very firmly in position, and clamping it withoutabrading or destroying the surface against which the jaw members engage.The subordinate tool holder projects beyond the head 1 and theprojecting part is coned somewhat, and on the conical surface aregraduations extending entirely around the periphery of this part of thesubordinate tool holder.

On the face of the tool head 1 are a number of graduations 16, whichco-act as a Vernier scale with the graduations on the subordinate toolhead; as shown in the drawing this Vernier scale will enable the toolhead to be set to quarters of the graduations of the subordinate toolholder; as shown are graduations in 40 divisions; with the graduationsshown the workman is able to set the tool head to the 160th part of arevolution. The graduations and Vernier of course, may be made to anyscale or to any proportion of a circle.

Beyond the graduated part of the subordinate holder is a knurled gripsection 23 to aid in turning the subordinate holder in the head.

What I claim is 1. A boring tool, having in combination a head providedwith an eccentrioally located cylindrical holder socket and with atransverse passage of uniform diameter extending across said headparallel to the diameter thereof and intersecting said holder socket, atool holder provided with an eccentrically located tool socket, a toolgrip comprising movable jaws and a coupling screw engaging in saidtransverse passage. the meeting ends of said jaws being adapted to bedrawn by said coupling screw into gripping engagement with the toolholder inserted in said holder socket, substantially as described.

2 V g V V I 963,559

2. A boring tool, having in combination tions on said head, a toolholder grip, coma tool head provided with an eccentricallyprising'movable jaws and a coupling screw located cylindrical holdersocket with a engaging in said transverse passage, subtransverse passageof uniform diameter ex- .stantially as described. 5 tending across saidhead parallel to a diam- In testimony whereof, I sign this specifi- 15eter thereof, and. with a graduated face at cation in the presence oftwo witnesses.

the front of said head, a tool holder'pro- THOMAS J. HINES. vided withan eccentricallylocated tool WVitnesses: 7 socket and with a graduatedface adapted to CHARLES F. BURTON,

V 10 co-act in vernien relation, with the gradua- VIRGINIA Ci SPRA'rr.

